The main building of the racetrack, not to mention in the Tang Dynasty over 1300 years ago, could not be built even in modern times.
Because it is a pure wooden multi-tiered racetrack, somewhat like an irregularly shaped, not round nor square, ancient wooden Roman Colosseum.
A wooden structure that can hold tens of thousands of spectators, cheer and jump, and remain firm and stable, is impossible to replicate in reality.
However, in the virtual world, it's quite simple; it's just a matter of adjusting a parameter.
Of course, in order to give the audience a strong sense of reality, Cloud Dream did not make the grandstands completely indestructible, but set a strength limit and added a "vibration feedback" function, so that the stands would shake along with the jump of the players.
If a large number of players jump at the same frequency, the stand will collapse.
The development team even set an achievement for this: [Passion's Weight]